Type action drive

ABSTRACT

Each type action of a typewriter has a drive member connected with the type bar and a coupling member pivotally mounted on the drive member and cooperating in a coupled position with a power roll. The coupling member has a camming surface cooperating with an adjustable guide means mounted on the supporting frame of the typewriter, and camming the coupling member out of engagement with the power roll. By adjustment of the guide means different impacts of the type bar can be obtained, as required by types having different surface areas, or if particularly great numbers of copies have to be made.

United States Patent lnventor Appl. No. Filed Patented Assignee PriorityTYPE ACTION DRIVE 10 Claims, 5 Drawing Figs.

u.s. c1 1277/17 1m. 01 B411 23/06 mm of Search 197/17 References CitedUNITED STATES PATENTS 11/1962 Demmel 9/1963 Roggenstein. 4/1964 HeyerPrimary Examiner- Edgar S. Burr A!!0rne vMichael S. Striker ABSTRACT:Each type action of a typewriter has a drive member connected with thetype bar and a coupling member pivotally mounted on the drive member andcooperating in a coupled position with a power roll. The coupling memberhas a camming surface cooperating with an adjustable guide means mountedon the supporting frame of the typewriter, and camming the couplingmember out of engagement with the power roll. By adjustment of the guidemeans different impacts of the type bar can be obtained, as required bytypes having different surface areas, or if particularly great numbersofcopies have to be made.

PATENTEMuv 30 I97! SHEET 1 OF 3 U 1 I W PATENTEDNUV 30 IBII SHEET 2 0F 3INVENTOR Mia/Frey $10k BY ATTORNEY TYPE ACTION DRIVE BACKGROUND OF THEINVENTION Type actions in which a coupling member pivotally mounted on adrive member is operated by power roll, such as a snatch roll, areknown, which provide a stop for engaging the coupling member during itsmovement with the power roll, and effect separation of the couplingmember from the power roll.

The German Pat. Nos. 521,880 and 1,203,802 disclose type actionsincorporating stops serving this purpose. However, in the constructionsof the prior art, very great friction is produced between the couplingprojection of the coupling member, and the tooth of the snatch rollengaging the same due to the relative movement between the two parts.For a moment, the coupling member and the snatch roll are forcefullypressed against each other before they separate.

The US. Pat. No. Re., 25,01 1 discloses a type action without a stop forseparating the coupling member from the snatch roll, and a separation isefiected by moving the drive member with the coupling member along apath which deviates from the periphery of the snatch roll. An adjustmentof the impact force of the individual type actions is accomplished bybending the coupling member. In this construction, it is also possiblethat a tooth of the snatch roll exerts momentarily great pressure on thecoupling member before the same is cammed by the tooth of the snatchroll out of engagement with the same.

SUMMARY OF THE INVENTION It is one object of the present invention toovercome the disadvantages of known type action drives, and to provide atype action drive in which the separation of the coupling member fromthe power roll takes place gradually and smoothly without exertion ofpressure on the coupled parts.

Another object of the invention is to provide a plurality of type actiondrives which can be individually and collectively adjusted in accordancewith the desired impact force.

Another object of the invention is to move the coupling member byresilient means into coupling engagement with the power roll, but topositively move the coupling member out of engagement with the powerroll by camming engagement between a part of the coupling member with aguide.

Another object of the invention is to gradually move the coupling memberout of engagement with the power roll.

With these objects in view, the present invention is concerned with animproved type action drive for a typewriter having a power roll andsupporting means.

One embodiment of the invention comprises a drive member mounted forturning movement about a first axis; a coupling member mounted on thedrive member for turning movement about a second axis between aninoperative position and an operative position coupled with the powerroll and driven by the same together with the drive member; manuallyoperated means for moving the coupling member from the inoperativeposition to the operative position so that the drive member is drivenand operates the type action; and a guide means mounted on thesupporting means of a typewriter and having a guide surface engaged byanother guide surface on the coupling member during movement of thecoupling member with the power roll.

In accordance with the invention, one of the guide surfaces is a curvedcamming surface having a center of curvature substantially coincidingwith the first axis so that the coupling member is gradually moved tothe inoperative position during rotation of the power roll and isgradually withdrawn from the same.

In the preferred embodiment of the invention, the camming surface isprovided on an arm of the coupling member and has a center of curvaturesubstantially coinciding with the axis of the drive member. Preferably,the arm with the camming surface is located farther spaced from thesecond axis of the coupling member than the coupling projection whichcooperates with the power roll.

By adjusting of the position of the guide means, the precise moment ofengagement of the camming surface of the coupling member, and therebythe impact force of the type bar of the respective type action, can bedetermined.

Due to the fact that the camming surface has a center of curvaturelocated in the turning axis of the drive member, the separation of thecoupling projection of the coupling member from the tooth of the snatchroll is gradual and no substantial friction or pressure can develop.

The novel features which are considered as characteristic for theinvention are set forth in particular in the appended claims. Theinvention itself, howevei', both as to its construction and its methodof operation, together with additional objects and advantages thereof,will be best understood from the following description of specificembodiments when read in connection with the accompanying drawing.

BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a fragmentary elevationillustrating a type action drive according to the invention in aposition of rest;

FIG. 2 is a fragmentary side elevation illustrating the type actiondrive in a coupled position obtained by depression of a key;

FIG. 3 is a fragmentary elevation illustrating the type action drive inthe moment of the separation of the coupling member from a snatch roll;

FIG. 4 is a fragmentary elevation illustrating the type action drive atthe beginning of the return movements of the parts to the position ofrest while the key is held in the depressed position; and

FIG. 5 is a fragmentary elevation illustrating the detail of the typeaction drive in coupled condition, similar to FIG. 3.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The supporting frame means ofthe typewriter which is provided with type action drives according tothe invention, include a support 1 having slots in which an upper link 2and a lower link 3 are mounted on pivot shafts. The other ends of links2 and 3 are pivotally connected to a stem portion ofa key lever 4 whichhas an abutment portion 5 abutting a stop bar 6, common to a row of keylevers 4, under the action of spring 7 which connects a hook portion oflink 3 with a partly shown bar 8, which is either fixed on support 1, oradjustably mounted on the same for varying the pressure required foroperation of the keys. The action of spring 7 urges key lever 4 to itsnormal position of rest abutting stop bar 6. As shown in FIG. 2,depression of key lever 4 moves abutment portion 5 away from stop bar 6.

The lower link 3 has a downwardly projecting arm carrying a pivot onwhich a trigger 9 is pivotally mounted. A spring 10 connects trigger 9with a point of link 3 so that trigger 9 is biassed to turn in clockwisedirection, as viewed in the drawing, to a position in which atransversely projecting, bentover lug or projection 11 abuts the lowerarm of link 3. Trigger 9 cooperates with the end of an arm of a controllever 13 which is mounted for turning movement on a pivot pin 15 carriedby a drive member 14. Drive member 14 is mounted on support 1 forangular movement about a pivot 16. A spring 17 is secured to arm 23 ofdrive member 14 and biases the same in clockwise direction to a positionin which an arm of drive member 14 abuts a stop bar 25 common to alltype actions. A wire link 24 connects arm 23 with a linkage connectedwith the type bar, not shown, and in the position of rest of drivemember 14 shown in FIG. I, the type bar is in a position of rest. Drivemember 14 carries a pivot pin 19 on which a coupling member 20 ismounted for angular movement. A spring 21 connects coupling member 20with control lever 13 and biases coupling member 20 to turn in clockwisedirection until abutting a projection on control lever 13 which holdscoupling member 20 in the inoperative position in which a couplingprojection 20a thereon is spaced from the teeth of snatch roll 35 whichrotates continuously in the direction of the arrow a.

Coupling member has a curved arm 22 whose rear face abuts arm 23 ofdrive member 14 in the position of rest shown in FIG. 1, whereby alsothe angular position of control lever 15 is determined so that thetransverse projection 13a thereof is spaced from the recessed endportion of trigger 9.

A guide means 31 is mounted on a pivot pin 32 located in a slot ofsupport 1 and has an arm 33 provided with a wear and noise resistantenvelope 34 which is located in the proximity of arm 22 of couplingmember 20. The other arm of guide means 31 is forked and has a slot intowhich a projecting portion of an adjusting screw 27 projects. Adjustingscrew 27 is threaded into a bore in a supporting bracket 18 which isfixed on the supporting means of the typewriter. An elastic layer 28frictionally engages the head of screw 27 so that the same is securedagainst undesired turning which would change the position of portion 29,and thereby the position of the angular guide lever means 31.

The bar 26 is common to all type actions of a row, and by adjusting theposition of the bracket 18, the positions of all angular guide levermeans 31 of the row of type actions can be simultaneously adjusted,whereas by adjustment of individual screws 27, the guide lever means 31of the respective type action is adjusted to vary the position of arm 33with cover 34 relative to the front surface of the curved arm 34. Duringoffice use of the typewriter, screws 27 are adjusted to permanently holdarm 22 in a predetermined position in relation to the front surface ofarm 33,

As will be explained hereinafter in detail, the concave front surface ofarm 22 cooperates with the surface of the cover 34, and is a cammingsurface having its center of curvature substantially in the axis ofpivot 16 of drive member 14.

On the pivot shaft 36, which supports the lower links 3 of the row oftype actions, two lever arms 37 are mounted for angular movement whichare connected by an abutment bar means 39 having an elastic cushion bar,which is engaged by links 3 in the position of FIG. 2 upon actuation ofthe key lever 4. Levers 37 have abutment portions 38 and are: biased byspring 40 to abut stop bar 6 on which also the abutment portions 5 ofthe key levers 4 abut in the position of rest.

OPERATION In the position of rest shown in FIG. 1, snatch rollcontinuously rotates in bearings, not shown, of the supporting means 1.The coupling projection 20a of coupling member 20 is spaced from theteeth of the snatch roll 35 and arm 33,34 of guide means 31 is spacedfrom the concave camming surface of arm 22 of coupling member 20. Spring17 holds drive member 14 in the operative position abutting stop bar 25so that the type bar, not shown, is in a position of rest. Spring 7holds key lever 4 with the key button in the normal inoperativeposition.

When a key lever 4 is depressed, as shown in FIG. 2, links 2 and 3 aredisplaced, abutment portion 5 moves away from stop bar 6, and link 3abuts the elastic stop bar means 39 so that lever arms 37 slightly turnabout pivot shaft 36 against the action of spring 40 so that theoperator does not feel a solid stop, but a yielding limitation of themovement of key lever 4.

Due to the angular displacement oflink 3, trigger 9 is raised in thedirection of arrow b and pushes against the transverse bentover lug 13aof control lever 13 so that the same turns in the direction of the arrowc, see FIG. 1, and transmits a turning motion through spring 21 tocoupling member 20 so that the coupling projection 20a engages a toothof snatch roll 35 while projection 13b of control lever 13 separatesfrom projection 20b of coupling member 20. As shown in FIG. 2, couplingmember 20 is now in an operative position in which coupling projection20a is located at the bottom of a notch between teeth of snatch roll 35,so that during rotation of the snatch roll 35 in the direction of thearrow a coupling member 20 is rapidly accelerated while couplingprojection 20:: moves along a circular path corresponding to theperiphery of the snatch roll about the axis of the latter.

Although coupling member 20 is angularly displaced in the operativecoupling position, the concave camming front face of arm 22 is stillspaced from the guide surface of arm 33,34 of guide means 31.

While snatch roll 35 drives coupling member 20, the motion istransmitted by pivot 19 to drive member 14 which is accelerated in thedirection of the arrow if so that motion is transmitted to the type bar,not shown, so that the same moves toward the platen, not shown.

During the angular movement of drive member 14 about the axis of pivot16, the camming surface of arm 22 of coupling member 20 moves to aposition engaging the arm 34,33 of guide means 31, as shown in FIG. 3.While coupling member 20 with drive member 14 is further transported bysnatch roll 35, the camming surface of arm 22 slides on the wear andnoise resistant cover 34 of guide means 31, and the curvature of thecamming face is selected so that coupling projection 20a is continuouslyand gradually withdrawn from the engaging tooth of snatch roll 35.

Due to the fact that the center of curvature of the concave cammingsurface of arm 22 substantially coincides with the axis of turningmovement of drive member 14 defined by pivot 16, the withdrawal andretraction of coupling projection 20a from the engaging tooth of thesnatch roll is continuous and gradual, and at no time during thismovement, pressure has to be exerted by the tooth of the snatch roll onthe coupling projection 20a for the purpose of camming couplingprojection 20a out of engagement with the respective tooth of the snatchroll, If the motion of the coupling member is graphically illustratedover the time, the curve is continuous and has no break. F IG. 5illustrates the position of FIG. 3 on a larger scale.

When frame means to the camming action between arm 22 and guide means31, the engagement between the coupling member 20 and the snatch roll 35has ended, spring 21 pulls coupling member 20 to a position in which itsprojection 20:) abuts projection 13b of control lever 13 while couplingmember 20 with arm 22 turns away from the arm 33,34 of guide MEANS 31.At the same time, spring 17 returns drive means 14 action the positionof rest abutting stop bar 25. Even if key lever 4 is held in thedepressed condition, as shown in FIG. 4, after the type action hasproduced an imprint, a repeated actuation of the type action is notpossible, since the transverse lug or projection 13a of control lever 13assumes a position forwardly of trigger 9 and 2, the same against theaction ofspring 10 so that the transverse lug 11 is withdrawn and spacedfrom link 3 until the same is turned in counterclockwise direction byspring 7 and lowers trigger 9 to a position in which it is released bythe projecting lug 13a, and can be turned by spring 10 to the normalposition of rest in which transverse projection 11 abuts link 3, asshown in FIG. 1. All parts are now in the position of rest, except keylever 4 which can be released at any time by the operator to be returnedby spring 7 to the position of rest as shown in FIG. 1. Of course, keylever 4 can be released earlier, any time after coupling member 20 hasassumed the operative position as shown in FIG. 2. It It is well knownthat type actions controlling small types, such as types representing aperiod or comma, should be associated with a lesser impact of the typebar than types representing large characters such as M or W. In order toadjust the impact force of any type action according to the invention inaccordance with the size of the type face area, the respective adjustingscrew 27 is turned so that portion 29 angularly displaces guide means 31whereby the guide surface on arm 33,34 is displaced relative to thecamming guide surface of arm 22 ofcoupling member 20, In this manner,the moment at which the camming surface engages the noise reducing cover34 of arm 33 is varied, so that after adjustment of screws 27 of severaltype actions, the retraction of the respective coupling member 20 fromthe operative position coupled with snatch roll 35, takes place earlieror later, as required for producing different impact forces of type barswith types of different size. Evidently, the longer coupling member 20remains coupled to the snatch roll 35, the greater will be the impact ofthe type action, which may be suitable for a large capital letter. Theadjusting screws 27 of the several type actions which are arranged in arow along snatch roll 35, serve in this manner for individuallyadjusting the impact forces produced by the respective type actions.When the entire bracket 18 with the bar portion 26 is raised or loweredby adjusting screws, not shown, the impact forces produced by all typeactions of the row, are simultaneously varied to the same degree, as isadvantageous for adapting the typewriter to typing of a smaller orgreater number of carbon copies, while the relative impact forces of theseveral type actions remain adjusted, as before, when bar 26 isadjusted.

The adjustment of the position of one guide means 31 individually, or ofall guide means 31 of a row, will displace the center of curvature ofthe camming surface of arm 22 relative to the axis of pivot 16 aboutwhich drive member 14 turns. However, tests have shown that the effectof such displacement is negligible, and does not detrimentally affectthe smooth and gradual withdrawal of coupling projection 20a from thetooth of snatch roll 35 under the control of the cooperating guidesurfaces of arm 22 of coupling member and arm 33,34 ofguide means 31.

It will be understood that each of the elements described above, or twoor more together, may also find a useful application in other types oftype action drives differing from the types described above.

While the invention has been illustrated and described as embodied in atype lever action in which a coupling member is gradually cammed out ofengagement with the snatch roll, it is not intended to be limited to thedetails shown, since various modifications and structural changes may bemade without departing in any way from the spirit of the presentinvention.

What is claimed as new and desired to be protected by Letters Patent isset forth in the appended claims.

1. In a typewriter having supporting means, and a rotary power roll, incombination, a plurality of type action drives, each type action drivecomprising a drive member mounted on said supporting means for turningmovement about a first axis; a coupling member mounted on said drivemember for turning movement about a second axis between an inoperativeposition out of contact with said power roll, and an operative positioncoupled with said power roll and moving along a first path about saidsecond axis while moving with said drive member along a second pathabout said first axis for operating the respective type action, saidcoupling member having a first guide surface; manually operated meansfor moving said coupling member from said inoperative position to saidoperative position; a guide means movably mounted on said supportingmeans and having a second guide surface engaged only by said first guidesurface of the same type action during movement of said coupling memberwith said power roll, one of said first and second guide surfaces beinga curved camming surface having a center of curvature coinciding withsaid first axis when the movement of said coupling member along saidfirst and second paths causes separation of said coupling member fromsaid power roll so that said first guide surface of said coupling membermoves along said second guide surface to said inoperative position andsmoothly disengages from said power roll; and a manual adjusting meansindependent of the other type action drives, and operatively connectedwith said guide means for displacing said guide means relative to saidcoupling member so that the moments of engagement between said first andsecond guide surfaces and of separation of said coupling member fromsaid power roll can be independently varied for each type action drive.

2. Type action drive as claimed in claim 1 wherein said first guidesurface is said camming surface and has a center of curvature coincidingwith said first axis of said drive member.

3. Type action drive as claimed in claim 1 wherein said coupling memberhas a coupling projection and a guide arm transverse to said couplingprojection and having said first guide surface; wherein said first guidesurface is curved and is said camming surface; wherein said first guidesurface is located farther spaced from said second axis than saidcoupling projection and has said center of curvature coinciding withsaid first axis; and wherein said guide means has a portion having saidsecond guide surface and being in sliding engagement with said cammingsurface.

4. In a typewriter having supporting means, and a power roll, incombination, a type action drive comprising a drive member mounted onsaid supporting means for turning movement about a first axis; acoupling member mounted on said drive member for turning movement abouta second axis between an inoperative position out of contact with saidpower roll, and an operative position coupled with said power roll anddriven by said power roll together with said drive member, said couplingmember having an arm with a first guide surface; manually operated meansfor moving said coupling member from said inoperative position to saidoperative position so that said drive member is driven and operates thetype action; and a guide means including a guide lever mounted on saidsupporting means for turning movement and having a second guide surfaceengaged by said first guide surface during movement of said couplingmember with said power roll and an arm formed with a slot; said firstguide surface being a curved camming surface having a center ofcurvaturesubstantially coinciding with said first axis so that said couplingmember is gradually moved by said second guide surface to saidinoperative position during rotation of said power roll; and manualadjusting means mounted on said supporting means and having anadjustable portion located in said slot, said adjusting means providingturning movement of said guide lever so that the moments of engagementbetween said guide lever and said camming surface and of separation ofsaid coupling member from said power roll can be varied by adjustmentofsaid adjusting means,

5. A plurality of type action drives as claimed in claim 4 comprisingadjusting means mounted on said supporting means and being connectedwith said guide means of said type actions for simultaneously adjustingthe positions of the same so that the moments ofengagement between saidguide means and said coupling members and of separation of said couplingmembers from said power roll can be collectively varied by saidadjusting means.

6. A plurality of type action drives as claimed in claim 5 wherein saidadjusting means include an adjustable bar, and a plurality of adjustingscrews threadedly mounted on said bar and engaging said guide means ofsaid type action drives, respectively, so that the position of eachguide means can be individually adjusted by said adjusting screws,respectively.

7. Type action drive as claimed in claim 4 wherein said adjusting meansincludes an adjusting screw threaded into a bore of said supportingmeans and having said portion which is located in said slot.

8. Type action drive as claimed in claim 4 wherein said guide lever isangular and has a first arm formed with said slot and a second armcooperating with said camming surface, and includes a pivot between saidarms; and wherein said supporting means are formed with a slot receivingsaid pivot.

9. A plurality of type action drives as claimed in claim 4 wherein eachtype action drive comprises a key lever; spring biassed linkage meansconnecting said key lever with said coupling member for moving the samefrom said inoperative position to said operative position upon actuationof said key lever; and a stop bar resiliently mounted on said supportingmeans for stopping said key levers after actuation of said couplingm'embers, respectively.

10. Type action drive as claimed in claim 1 wherein said coupling memberhas an arm with s aid first guide surface; wherein said first guidesurface is said camming surface; wherein said guide means is mounted forturning movement; and wherein said manual adjusting means is mounted onsaid supporting means and being operatively connected with said guidemeans for angularly displacing the same so that the moments ofengagement between said guide means and said camming surface and ofseparation of said coupling member from said power roll can be varied byadjustment of said adjusting means.

1. In a typewriter having supporting means, and a rotary power roll, incombination, a plurality of type action drives, each type action Drivecomprising a drive member mounted on said supporting means for turningmovement about a first axis; a coupling member mounted on said drivemember for turning movement about a second axis between an inoperativeposition out of contact with said power roll, and an operative positioncoupled with said power roll and moving along a first path about saidsecond axis while moving with said drive member along a second pathabout said first axis for operating the respective type action, saidcoupling member having a first guide surface; manually operated meansfor moving said coupling member from said inoperative position to saidoperative position; a guide means movably mounted on said supportingmeans and having a second guide surface engaged only by said first guidesurface of the same type action during movement of said coupling memberwith said power roll, one of said first and second guide surfaces beinga curved camming surface having a center of curvature coinciding withsaid first axis when the movement of said coupling member along saidfirst and second paths causes separation of said coupling member fromsaid power roll so that said first guide surface of said coupling membermoves along said second guide surface to said inoperative position andsmoothly disengages from said power roll; and a manual adjusting meansindependent of the other type action drives, and operatively connectedwith said guide means for displacing said guide means relative to saidcoupling member so that the moments of engagement between said first andsecond guide surfaces and of separation of said coupling member fromsaid power roll can be independently varied for each type action drive.2. Type action drive as claimed in claim 1 wherein said first guidesurface is said camming surface and has a center of curvature coincidingwith said first axis of said drive member.
 3. Type action drive asclaimed in claim 1 wherein said coupling member has a couplingprojection and a guide arm transverse to said coupling projection andhaving said first guide surface; wherein said first guide surface iscurved and is said camming surface; wherein said first guide surface islocated farther spaced from said second axis than said couplingprojection and has said center of curvature coinciding with said firstaxis; and wherein said guide means has a portion having said secondguide surface and being in sliding engagement with said camming surface.4. In a typewriter having supporting means, and a power roll, incombination, a type action drive comprising a drive member mounted onsaid supporting means for turning movement about a first axis; acoupling member mounted on said drive member for turning movement abouta second axis between an inoperative position out of contact with saidpower roll, and an operative position coupled with said power roll anddriven by said power roll together with said drive member, said couplingmember having an arm with a first guide surface; manually operated meansfor moving said coupling member from said inoperative position to saidoperative position so that said drive member is driven and operates thetype action; and a guide means including a guide lever mounted on saidsupporting means for turning movement and having a second guide surfaceengaged by said first guide surface during movement of said couplingmember with said power roll and an arm formed with a slot; said firstguide surface being a curved camming surface having a center ofcurvature substantially coinciding with said first axis so that saidcoupling member is gradually moved by said second guide surface to saidinoperative position during rotation of said power roll; and manualadjusting means mounted on said supporting means and having anadjustable portion located in said slot, said adjusting means providingturning movement of said guide lever so that the moments of engagementbetween said guide lever and said camming surface and of separation ofsaid coupling member from said power Roll can be varied by adjustment ofsaid adjusting means.
 5. A plurality of type action drives as claimed inclaim 4 comprising adjusting means mounted on said supporting means andbeing connected with said guide means of said type actions forsimultaneously adjusting the positions of the same so that the momentsof engagement between said guide means and said coupling members and ofseparation of said coupling members from said power roll can becollectively varied by said adjusting means.
 6. A plurality of typeaction drives as claimed in claim 5 wherein said adjusting means includean adjustable bar, and a plurality of adjusting screws threadedlymounted on said bar and engaging said guide means of said type actiondrives, respectively, so that the position of each guide means can beindividually adjusted by said adjusting screws, respectively.
 7. Typeaction drive as claimed in claim 4 wherein said adjusting means includesan adjusting screw threaded into a bore of said supporting means andhaving said portion which is located in said slot.
 8. Type action driveas claimed in claim 4 wherein said guide lever is angular and has afirst arm formed with said slot and a second arm cooperating with saidcamming surface, and includes a pivot between said arms; and whereinsaid supporting means are formed with a slot receiving said pivot.
 9. Aplurality of type action drives as claimed in claim 4 wherein each typeaction drive comprises a key lever; spring biassed linkage meansconnecting said key lever with said coupling member for moving the samefrom said inoperative position to said operative position upon actuationof said key lever; and a stop bar resiliently mounted on said supportingmeans for stopping said key levers after actuation of said couplingmembers, respectively.
 10. Type action drive as claimed in claim 1wherein said coupling member has an arm with said first guide surface;wherein said first guide surface is said camming surface; wherein saidguide means is mounted for turning movement; and wherein said manualadjusting means is mounted on said supporting means and beingoperatively connected with said guide means for angularly displacing thesame so that the moments of engagement between said guide means and saidcamming surface and of separation of said coupling member from saidpower roll can be varied by adjustment of said adjusting means.